handles enemy respawning properly

main/main.gd

@@ -23,12 +23,19 @@ func spawn_enemies():
 			var e = enemy.instantiate()
 			var pos = Vector2(x * (16 + 8) + 24, 16 * 4 + y * 16)
 			add_child(e)
-			e.start(pos)
-			e.died.connect(_on_enemy_died)
+			e.call_deferred("start", pos)
+			e.connect("died", Callable(self, "_on_enemy_died"))
+			e.add_to_group("enemies")
+
+	enemies_count = 27
 			
 func _on_enemy_died(value):
 	score += value
 	$CanvasLayer/UI.update_score(score)
+	enemies_count -= 1
+
+	if enemies_count == 0:
+		call_deferred("spawn_enemies")
 
 func _on_start_pressed():
 	start_button.hide()
@@ -41,11 +48,3 @@ func _on_player_died():
 	game_over.hide()
 	start_button.show()
 	
-
-func _on_child_entered_tree(node):
-	if node.is_in_group("enemies"):
-		enemies_count += 1
-
-func _on_child_exiting_tree(node):
-	if node.is_in_group("enemies"):
-		enemies_count -= 1